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Sitecore has released Publishing Service Module 1.1 along with Sitecore 8.2 version. Latest version of publishing service avaiable on Sitecore website is Sitecore Publishing Service 2.0 Update-1. This version of the Publishing Service is compatible with Sitecore 8.2 Update-2 and Sitecore 8.2 Update-3. This module is based on Windows Server Hosting (.NET Core). Below are FAQs about Sitecore publishing service

What is Sitecore publishing service?
The Sitecore Publishing Service (“SPS”) module is an optional replacement for the existing Sitecore publishing methods. This module increases publishing throughput, reduces the amount of time spent publishing large volumes of items, and offers greater data consistency and reliability. The module also improves the user experience and provides better visual feedback to the user on the state of the publishing system. The Publishing Service does not use any of the features, pipelines, and settings in the current publishing system, it is an entirely new way of publishing Sitecore items and media.

Does Sitecore publishing service require new license?
There are no incremental Sitecore license implications for installing the service.

What are the infrastructure requirement of Sitecore publishing service? Can it be installed in existing DB/CM servers?
Sitecore Publishing Service is a lightweight service which can be installed on an existing CM/DB server or entirely new VM. While Sitecore Publishing Service will improve publishing performance, it will be important to test and monitor for potential bottlenecks in the Master and Web databases during high throughput publishing. Installation Guide for Publishing Service has some settings that can be configured to improve performance. https://dev.sitecore.net/Downloads/Sitecore_Publishing_Service.aspx
Generally, it is better to have SPS as ‘close’ to the Database Server as possible. It does not have a large footprint and is not massively CPU/Memory hungry so a new dedicated VM may not be necessary. The Sitecore Publishing Host needs to be installed first and has a dependency on .NET Core. Sitecore recommend running it under IIS which requires installing Windows Server Handling package.

Does publishing service uses old APIs?
One of the main differences between the new and old publishing is the data layer. Unlike the old publishing, the publishing service doesn’t talk to the databases via the Sitecore item APIs. However, it uses its own data layer, which only performs databases operations in bulks. The bulk operations improve the performance dramatically by mitigating the network latency problems

How fast is Sitecore Publishing Service as compare to old publishing Method?
We did a POC to compare the performance of the new publishing service vs old publishing method on Sitecore 8.2 with 100,000 items. Standard publishing method took 4:37 hours to publish 100,000 items whereas publishing service took only 6-7 minutes. We did this test on standard VM so this performance can be higher with better hardware machine but important point is that publishing server is much faster than old publishing method